Professor Quirrell was too gullible and succumbed to Voldemort's manipulation, becoming his human host. Voldemort latched onto Quirrell's body, his face appearing on the back of the professor's head, and he used him to search for the Philosopher's Stone and infiltrate Hogwarts during Harry Potter's first school year.
However, Voldemort, after finding out that he taught at Hogwarts, took over his body, subsequently turning him into a temporary Horcrux, though Quirrell put up some feeble resistance. He died in vain while trying to murder Harry Potter in the Underground Chambers.
Quirinus Quirrell served as a temporary Horcrux when Voldemort's soul possessed his body in 1991. However, the piece of the soul survived Quirrell's demise, and was destroyed six years later when Voldemort was killed.
He remained alive because of his Horcruxes, but existed in a spectral form as his soul had been driven from his body. In this form, he went into hiding in Albania.
Lily's sacrifice and her love saved Harry. Voldemort can not comprehend love, and so it destroys him to touch Harry because Lily's love for her son runs through Harry's veins and body. ems Harry burnt Quirrell's face when he touched it.
Harry Potter Theory: Was Professor Quirrell a Horcrux?
Did Snape know about Quirrell?
Snape's explanation to the Death Eaters was that he knew nothing of Voldemort's involvement, but "saw only greedy and unworthy Quirrell attempting to steal the stone." It was confirmed in Deathly Hallows that Snape had been "keeping an eye" on Quirrell on Dumbledore's orders.
He explains also that Quirrell could not touch Harry because Harry was protected by his mother's love. Dumbledore also reveals that it was he who left the invisibility cloak for Harry and explains that there was enmity between Snape and Harry's father, much like the enmity between Malfoy and Harry.
Notably, Voldemort appeared to be entirely unaware of this split, as he later created a seventh Horcrux in his quest to have six, and continued to target Harry Potter despite him now holding part of Voldemort's own soul.
Under the influence of her father, Dolores grew up despising her mother and brother for their lack of magical abilities. She was sorted into Slytherin House at Hogwarts School of Witchcraft and Wizardry and hated her time at the school due to never being given any positions of power.
Professor Quirrell was a temporary type of Horcrux while Voldemort inhabited his body, which is confirmed in the Wizarding World. It is possible that Voldemort created more temporary Horcruxes, such as the animals he possessed while in ghostly form.
Quirrell Was A Muggle Studies Teacher Before He Taught Defense Against The Dark Arts. Photo: Harry Potter and the Sorcerer's Stone/Warner Bros. From Redditor u/amyosaurus: According to J.K. Rowling: He was teaching at Hogwarts for more than a year, but NOT in the post of D.A.D.A.
The prevailing theory has been that Voldemort gradually lost his nose (and humanity) throughout his life due to his exclusive use of Dark Magic. The more Dark Magic he tapped into, the less human he became both figuratively and literally. This was only amplified as he split his soul to create the Horcruxes.
There were 8 horcruxes. 7 were made by Voldemort intentionally ( Nagini, goblet, diary, locket, ring, diadem and the part of his soul in Voldemort himself) and 1 was made accidentally which was Harry.
How did Dumbledore know what happened with Quirrell?
TL; DR - Dumbledore knew by Quirrell's behavior that he was possessed by Voldemort. He moves Quirrell to Defense Against the Dark Arts to remove him (and Voldemort) from the school by the end of the year.
Quirrell went on his trip to get “first hand experience” the summer of 1990 and Harry's first year at hogwarts is 1991–1992 therefor Quirrell. Had Voldy stuck to the back of his head for about a year or two. Seeing as he died at the end of the school year Voldemort left Quirrell early to mid-1992.
While most fans agree that Harry is the unrefuted Chosen One, the final Deathly Hallows film (in particular) sways heavily toward highlighting a heroic Neville, revitalizing the debate regarding which boy is better suited for the iconic title. "The one with the power to vanquish the Dark Lord approaches ...
Dumbledore knew about Horcruxes. He knew how they were formed, what happened after that, etc. He probably got to know Harry was a Horcrux when he saw the Scar on Harry's forehead, but maybe he wasn't sure.
On confirming Draco's very much alive status, she plainly lied that Harry Potter was "dead". This action of hers was both very crucial and important, not only for Harry's survival but for Voldemort's final defeat as well, thus ensuring Harry was again protected by a mother's love, although indirectly.
Quirrell never lost his soul to Lord Voldemort, but he lost his body and ended up completely subjugated by Voldemort, with his head mutilated and Voldemort able to see out of the back of his head, forcing him to wear a turban.
Voldemort's desire to beat death and become immortal was also why he and Quirrell ended up slaying innocent unicorns. Drinking the blood of a unicorn would keep someone alive – even if they were an inch from death. However, it is considered an act of evil to kill something so pure.
After attempting to murder Harry as a baby, Voldemort was left without a physical form and was severely weakened. Voldemort was forced to flee to Albania to avoid anyone trying to hunt him down and had to possess animals to keep a physical form.
Voldemort's obsession with blood purity signifies his aim to rid the wizarding world of Muggle (non-magical) heritage and to conquer both worlds, Muggle and wizarding, to achieve pure-blood dominance.
